Vacuum type exhaust muffler



L 1 A. D. FLICKINGER 2,386,305

VACUUM TYPE EXHAUST MUFFLER Filed March 14, 1944 Patented Got. 9, 1945 UNITED STATES PATENT OFFICE VACUUM TYPE EXHAUST MUFFLER Alton D. Flickinger, Inglewood, Calif.

Application March 14, 1944, Serial No. 526,446

1 Claim.

This invention relates to a vacuum type exhaust, muffler, and has for one of its objects the production of a simple and efficient muffler especially adapted for use upon airplanes and the like, constructed to facilitate the discharge of exhaust gases from the muffler.

A further object of this invention is the production of a simple and efficient muffler so constructed as to efficiently eject exhaust gases from the muffler by passing a blast of air longitudinally through the center of the mufiler from end to end and by providing lateral ports throughout the length of the muifer for extracting the exhaust gases by means of a vacuum which is created by air currents passing over the streamline surface of the mufiier.

Other objects and advantages of the present invention will appear throughout the following specification and claim.

In the drawing:

Figure 1 is a side elevational view of the muffler;

Figure 2 is a longitudinal sectional view thereof;

Figure 3 is a sectional view taken on line 3--3 of Figure 1;

Figure 4 is a sectional view taken on line 44 of Figure 1;

By referring to the drawing, it will be seen that H) designates the streamline body of the muflier which is provided with a forward tapering nose I I having an air entrance opening 12 at the forward extremity thereof. An exhaust tube 13 connects the forward end of the body of the muffler with an engine of a suitable type and this tube communicates with the muffler exhaust entrance port M which is formed in one side of the body I near the air entrance opening l2 thereof. The exhaust tube [3 is secured to the mufiler III in any suitable manner, such for instance, by means of the rivets l3 which pass through the flange l3 and the mufiler body Ill.

The body [0 bulges to a point rearwardly of the port I4 and then tapers toward the rear end l5 of the body [0. The rear end i5 is provided with a discharge opening I6 which is in direct line with the air entrance opening [2. It should thereby be noted that as the airplane or other means is driven forwardly, a central current of air will pass in through the opening [2, then longitudinally of the body Ill and will be discharged out through the rear discharge opening l6, thereby drawing exhaust gases longitudinally of and out through the body It).

The receding outer wall of the body [0 is provided with a plurality of exhaust apertures l'l aligned circumferentially and also longitudinally of the body, as shown in Figures 1 to 3, of the drawing. Consequently, as the mufiler is carried forwardly, air currents will pass over the forward surface of the nose of the mufiier and will then be deflected from the tapering rear or receding portion of the body. This will build-up a vacuum around the outer surface of the tapering rear portion of the body l0, thereby causing the exhaust gases within the body ID to have or to be drawn out through the ports I? from the interior of the muffler body It. It will, therefore, be seen that I have provided two distinct scavenging means for the muflier to extract or to cause the exhaust gases to be discharged from the mufller. The central longitudinal blast will tend to draw the exhaust from the exhaust tube l3 into the mufiler and then drive these gases longitudinally of and out through the rear end of the muffler. At the same time the vacuum which is built-up around the exterior of the muffler will cause the exhaust gases to leave through the lateral apertures ll.

From the foregoing description it will be seen that a very simple muffler is provided having a minimum number of parts, and which may be manufactured and maintained at a minimum expense. It should be understood that the muffler may be mounted and supported in any suitable or desired manner, and since the present invention resides in the construction of the mufller itself, no attempt is made to illustrate mountings and other auxiliary parts which may be used with the mufller. Furthermore, it should be understood that certain changes in detail construction may be made without departing from the spirit of the invention so long as these changes fall within the scope of the following specification and claim.

Having described the invention, what I claim as new is:

A muflier of the class described comprising a one-piece stream-line body, said body having a lateral exhaust gas entrance port near its forward portion, said body being gradually enlarged in its transverse area from the forward portion to a point intermediate the ends of the body to provide a relatively large midway portion, said body tapering toward the rear end thereof, said body having a plurality of'vacuum ports in the tapering rear portion, said ports being located in an area of the body smaller in its transverse dimension than said midway portion to cause gases to be drawn by vacuum pull through said vacuum ports as the mufller is carried in a forward direction to cause a vacuum pull of the air rushing exteriorly and longitudinally of the body, and said body having forward and rear centrally located air inlet and outlet ports.

ALTON D. FLICKINGER. 

